[A child believed to have been secretly substituted for the parents' real child in infancy.]
See: Chimera Reptoids
Jim Morisson also sang
''I'm a Changeling
See me change..''
In the song The Changeling by the Doors
The devil steals a baby and leaves a changeling behind, early 15th century, detail of "The legend of St. Stephen" by Martino di Bartolomeo